Secret Rendezvous ??

Hoping some of you regulars may be able to answer a question concerning the secret rendezvous. I was attempting to price a trip in July using the secret rendezvous, but the calendar shows it unavailable. Is this something that becomes available closer to the dates in question? Currently it prices a secret rendezvous in March, so I would think there would be availability in July..it shows april-July blacked out. Any info and answers much appreciated!